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1. take a photo of the food junction
2. open in PS, duplicate the original image and desaturate it
3. go to Filter>Sketch>Stamp
4. Adjust the sliders and click OK, your image will become B/W
5. Use the magic wand, select a white patch. Then go to Select>All...you'll see that all white areas are selected.
6. Create a new layer...and fill in any colour that you like.

oh one more thing, how do u make such clean silhouettes(the crane pic)?

it's the same steps ... on diff is that...i paint areas that i wanted black and take out unwanted areas that i wanted white...it's fast and simple...frankly, that crane photo was a bad one, but it has strong graphic appeal...so i decided to do it that way.